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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.drill.exec.planner.common;
import java.io.IOException;
import java.util.List;
import org.apache.drill.common.expression.SchemaPath;
import org.apache.drill.exec.physical.base.GroupScan;
import org.apache.drill.exec.planner.logical.DrillTable;
import org.apache.drill.exec.planner.logical.DrillTranslatableTable;
import org.apache.drill.common.exceptions.DrillRuntimeException;
import org.apache.calcite.rel.core.TableScan;
import org.apache.calcite.plan.RelOptCluster;
import org.apache.calcite.plan.RelOptCost;
import org.apache.calcite.plan.RelOptPlanner;
import org.apache.calcite.plan.RelOptTable;
import org.apache.calcite.plan.RelTraitSet;
import org.apache.drill.exec.util.Utilities;
import org.apache.calcite.rel.metadata.RelMetadataQuery;
/**
* Base class for logical/physical scan rel implemented in Drill.
*/
public abstract class DrillScanRelBase extends TableScan implements DrillRelNode {
protected GroupScan groupScan;
protected final DrillTable drillTable;
public DrillScanRelBase(RelOptCluster cluster,
RelTraitSet traits,
RelOptTable table,
final List<SchemaPath> columns) {
super(cluster, traits, table);
this.drillTable = Utilities.getDrillTable(table);
assert drillTable != null;
try {
this.groupScan = drillTable.getGroupScan().clone(columns);
} catch (final IOException e) {
throw new DrillRuntimeException("Failure creating scan.", e);
}
}
public DrillScanRelBase(RelOptCluster cluster,
RelTraitSet traits,
GroupScan grpScan,
RelOptTable table) {
super(cluster, traits, table);
DrillTable unwrap = table.unwrap(DrillTable.class);
if (unwrap == null) {
unwrap = table.unwrap(DrillTranslatableTable.class).getDrillTable();
}
this.drillTable = unwrap;
assert drillTable != null;
this.groupScan = grpScan;
}
public DrillTable getDrillTable() {
return drillTable;
}
public GroupScan getGroupScan() {
return groupScan;
}
@Override public double estimateRowCount(RelMetadataQuery mq) {
return mq.getRowCount(this);
}
@Override public RelOptCost computeSelfCost(RelOptPlanner planner, RelMetadataQuery mq) {
double dRows = estimateRowCount(mq);
double dCpu = dRows + 1; // ensure non-zero cost
double dIo = 0;
return planner.getCostFactory().makeCost(dRows, dCpu, dIo);
}
}
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